Device for controlling the power of an AC motor

摘要

A device for controlling the power of an AC motor M having at least one capacitive bias impedance C1...Cn, a respective on/off switch S1...Sn for switching the associated capacitive bias impedance on and off, and a control device which has a zero-voltage detection circuit 1 which ensures that the respective capacitive bias impedance to be switched on is switched on at the zero-voltage crossing. <IMAGE>